2012
DOI: 10.1380/ejssnt.2012.360
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Preparation and Structural Investigation of PMMA-Polystyrene ‘Janus Beads’ by Rapid Evaporation of an Ethyl Acetate Aqueous Emulsion

Abstract: In this paper, the formation of microscopic polystyrene/poly(methyl methacrylate) Janus particles by using environmentally benign solvents and surface active agents is presented. Janus particles are formed by the rapid polymer phase separation that occurs when an oil-in-water suspension is allowed to dry. Biodegradable or bio-inert organic solvents and surface active agents are used. These solvents affect the particle morphology, which is studied in detail. The environmentally friendly solvent ethyl acetate ca… Show more

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Cited by 4 publications
(5 citation statements)
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“…One means of designing a facile and versatile route for the fabrication of both colloidal structures is through solution-based self-assemblya strategy that is already used to create Janus colloids with high degrees of structural and compositional complexity. ,,, The primary means by which such particles are fabricated involves dissolving multiple, chemically distinct polymers in a mutually favorable solvent and gradually altering the solubility character of the solution until the polymer molecules coprecipitate into self-organized structures. Because of the slow time scale of solvent exchange, the final morphology adopted by the colloids via solution self-assembly is often at thermodynamic equilibrium and unique to the particular processing conditions.…”
mentioning
confidence: 99%
“…One means of designing a facile and versatile route for the fabrication of both colloidal structures is through solution-based self-assemblya strategy that is already used to create Janus colloids with high degrees of structural and compositional complexity. ,,, The primary means by which such particles are fabricated involves dissolving multiple, chemically distinct polymers in a mutually favorable solvent and gradually altering the solubility character of the solution until the polymer molecules coprecipitate into self-organized structures. Because of the slow time scale of solvent exchange, the final morphology adopted by the colloids via solution self-assembly is often at thermodynamic equilibrium and unique to the particular processing conditions.…”
mentioning
confidence: 99%
“…Polystyrene fluoresces red, PMMA green.The scale bar is 20 µm. The particles were prepared by rapid evaporation of an oil-in-water emulsion (0.2 ml of ethyl acetate solution, 1 ml aqueous solution) for which PMMA was dissolved in ethyl acetate (3 mg/ml), and the emulsion was stabilised by adding sodium dodecyl sulphate (0.1 mg/ml) to the aqueous phase, without controlling its pH [9]. The emulsion was cast on a glass substrate and allowed to evaporate at ambient temperature.…”
Section: Objectivementioning
confidence: 99%
“…with sharper edges and deeper grooves) the pattern becomes, but the effect is not very pronounced, and the wrinkle structure does not depend critically on the thickness of the skin layer. In order to elucidate the effect of the thickness of the soft polymer layer, we produced core-shell particles for which polystyrene-core/PMMA-shell particles had been synthesised by rapid emulsion evaporation as already reported in the literature [9]. Polystyrene is inert towards electron beam irradiation and does not decompose.…”
Section: Objectivementioning
confidence: 99%
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“…The surface ornamentation of pollen grains point towards a phase-separation mechanism [10,11], and thus polymer blends are a promising approach to produce pollen-like microparticles [13]. It is a very common phenomenon that polymers that are cast from a common solvent tend to demix upon solvent removal [14].…”
Section: Introductionmentioning
confidence: 99%